Hairbrush



FIG. 1 is a top plan view of a hairbrush, showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side view, the side opposite that shown in FIG. 3 being asubstantial mirror image of the side shown in FIG. 3; and

FIG. 4 is an end view thereof.

The ornamental design for a hairbrush, as shown and described.